Air compressor



FIG. 1 is a left, front perspective view of an air compressor showing my new design;

FIG. 2 is a right, front perspective view thereof;

FIG. 3 is a lower rear perspective view of FIG. 1;

FIG. 4 is a rear perspective view of FIG. 2;

FIG. 5 is a rear perspective view of FIG. 1; and

FIG. 6 is a lower right front perspective view of FIG. 1. 

The ornamental design for an air compressor, as shown and described. 